syzbot


WARNING in ext4_dio_get_block_overwrite

Status: auto-closed as invalid on 2020/10/03 08:57
Reported-by: syzbot+b09c426cd5cc83e80118@syzkaller.appspotmail.com
First crash: 751d, last: 751d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 WARNING in ext4_dio_get_block_overwrite (2) 3 976d 1031d 0/1 auto-closed as invalid on 2020/02/21 05:41
android-414 WARNING in ext4_dio_get_block_overwrite 2 1290d 1170d 0/1 auto-closed as invalid on 2019/06/12 07:43
upstream WARNING in ext4_dio_get_block_overwrite 11 1218d 1308d 0/22 auto-closed as invalid on 2019/08/23 22:50
android-49 WARNING in ext4_dio_get_block_overwrite 8 958d 1169d 0/3 auto-closed as invalid on 2020/03/10 23:01

Sample crash report:
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 22242 at fs/ext4/inode.c:963 ext4_dio_get_block_overwrite fs/ext4/inode.c:963 [inline]
WARNING: CPU: 1 PID: 22242 at fs/ext4/inode.c:963 ext4_dio_get_block_overwrite+0x8d/0xc0 fs/ext4/inode.c:948
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 22242 Comm: syz-executor.4 Not tainted 4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x2f/0x30 kernel/panic.c:547
 report_bug+0x20a/0x248 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:ext4_dio_get_block_overwrite fs/ext4/inode.c:963 [inline]
RIP: 0010:ext4_dio_get_block_overwrite+0x8d/0xc0 fs/ext4/inode.c:948
RSP: 0018:ffff88804ccf7308 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88804ccf74b0 RCX: ffffc9000a525000
RDX: 0000000000040000 RSI: ffffffff81be706d RDI: ffff888215f28618
RBP: 000000000000007a R08: 0000000000000001 R09: 0000000000000001
R10: ffff88804301a8f0 R11: ffff88804301a040 R12: 0000000000000000
R13: ffff88804301a040 R14: 000000000000007a R15: ffff88801ad715c0
 get_more_blocks fs/direct-io.c:718 [inline]
 do_direct_IO fs/direct-io.c:1003 [inline]
 do_blockdev_direct_IO fs/direct-io.c:1336 [inline]
 __blockdev_direct_IO+0x3103/0xe97c fs/direct-io.c:1422
 ext4_direct_IO_write fs/ext4/inode.c:3716 [inline]
 ext4_direct_IO+0xeb8/0x1970 fs/ext4/inode.c:3852
 generic_file_direct_write+0x1df/0x420 mm/filemap.c:2950
 __generic_file_write_iter+0x2a5/0x590 mm/filemap.c:3129
 ext4_file_write_iter+0x279/0xd90 fs/ext4/file.c:270
 call_write_iter include/linux/fs.h:1778 [inline]
 do_iter_readv_writev+0x3df/0x600 fs/read_write.c:675
 do_iter_write fs/read_write.c:954 [inline]
 do_iter_write+0x152/0x550 fs/read_write.c:935
 vfs_iter_write+0x70/0xa0 fs/read_write.c:967
 iter_file_splice_write+0x52e/0xa10 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x27e/0x730 fs/splice.c:973
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x469/0xaf0 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1502 [inline]
 SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca69
RSP: 002b:00007ff5ac387c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000004fc580 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 00008400fffffffa R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008dc R14: 00000000004cba56 R15: 00007ff5ac3886d4
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2020/06/05 08:56 linux-4.14.y c6db52a88798 2420d1bc .config log report